import { readdirSync, readFileSync, statSync } from "node:fs";
import { dirname, join, resolve } from "node:path";
import { describe, expect, it } from "@suaveplan/testing/runner";

const PKG_DIR = resolve(__dirname, "..");
const pkg = JSON.parse(readFileSync(join(PKG_DIR, "package.json"), "utf8")) as {
    dependencies?: Record<string, string>;
    devDependencies?: Record<string, string>;
    exports?: Record<string, unknown>;
};

const ALLOWED_DEPS = new Set([
    "@opentelemetry/api",
    "@suaveplan/api-types",
    "@suaveplan/error",
    "@suaveplan/logger",
    "@suaveplan/rules",
    "tslib",
    "zod",
]);

function walk(dir: string, out: string[] = []): string[] {
    for (const name of readdirSync(dir)) {
        const p = join(dir, name);
        const st = statSync(p);
        if (st.isDirectory()) {
            if (name === "node_modules" || name === "dist") continue;
            walk(p, out);
        } else {
            out.push(p);
        }
    }
    return out;
}

describe("dep-graph", () => {
    it("dependencies match the allowlist", { timeout: 5000 }, () => {
        const deps = Object.keys(pkg.dependencies ?? {});
        for (const d of deps) {
            expect(ALLOWED_DEPS.has(d)).toBe(true);
        }
        for (const expected of [
            "@opentelemetry/api",
            "@suaveplan/api-types",
            "@suaveplan/error",
            "@suaveplan/logger",
            "@suaveplan/rules",
            "tslib",
            "zod",
        ]) {
            expect(deps).toContain(expected);
        }
    });

    it("subpath exports cover every feature", { timeout: 5000 }, () => {
        const exports = pkg.exports ?? {};
        const expected = [
            ".",
            "./middleware",
            "./registry",
            "./spec",
            "./error-codes",
            "./instruments",
        ];
        for (const e of expected) {
            expect(Object.keys(exports)).toContain(e);
        }
    });

    it("every impl .ts has a sibling .md", { timeout: 5000 }, () => {
        const srcDir = join(PKG_DIR, "src");
        const all = walk(srcDir);
        const missing: string[] = [];
        for (const file of all) {
            if (!file.endsWith(".ts")) continue;
            if (file.endsWith(".test.ts")) continue;
            if (file.endsWith(".spec.ts")) continue;
            if (file.endsWith(".spec-conformance.test.ts")) continue;
            if (file.endsWith(".types.ts")) continue;
            const base = file.replace(/\.ts$/, "");
            const fileName = base.split("/").pop();
            if (fileName === "index") continue;
            if (file === join(srcDir, "index.ts")) continue;
            const md = `${base}.md`;
            try {
                statSync(md);
            } catch {
                missing.push(md.replace(`${PKG_DIR}/`, ""));
            }
        }
        expect(missing).toEqual([]);
    });

    it("no biome suppressions in src/", { timeout: 5000 }, () => {
        const all = walk(join(PKG_DIR, "src"));
        const hits: string[] = [];
        for (const f of all) {
            if (!f.endsWith(".ts")) continue;
            if (f.endsWith(".test.ts")) continue;
            const txt = readFileSync(f, "utf8");
            if (txt.includes("biome-ignore")) hits.push(f);
            if (txt.includes("eslint-disable")) hits.push(f);
        }
        expect(hits).toEqual([]);
    });

    it("no banned patterns in src/", { timeout: 5000 }, () => {
        const banned = [
            "TODO",
            "FIXME",
            "ts-ignore",
            "ts-expect-error",
            "@deprecated",
            "console.log",
        ];
        const all = walk(join(PKG_DIR, "src"));
        const hits: { file: string; pattern: string }[] = [];
        for (const f of all) {
            if (!f.endsWith(".ts")) continue;
            if (f.endsWith(".test.ts")) continue;
            const txt = readFileSync(f, "utf8");
            for (const p of banned) {
                if (txt.includes(p)) hits.push({ file: f, pattern: p });
            }
        }
        expect(hits).toEqual([]);
    });

    it("no `export *` in feature barrels", { timeout: 5000 }, () => {
        const featureBarrels = readdirSync(join(PKG_DIR, "src"))
            .filter((entry) => {
                const p = join(PKG_DIR, "src", entry);
                try {
                    return statSync(p).isDirectory();
                } catch {
                    return false;
                }
            })
            .map((d) => join(PKG_DIR, "src", d, "index.ts"));
        const hits: string[] = [];
        for (const b of featureBarrels) {
            try {
                const txt = readFileSync(b, "utf8");
                if (/^export\s+\*/m.test(txt)) hits.push(b);
            } catch {
                /* directory may have no index.ts */
            }
        }
        expect(hits).toEqual([]);
    });
});

describe("layout invariants", () => {
    it("error-codes lives at src/error-codes/error-codes.ts", {
        timeout: 5000,
    }, () => {
        const inner = join(PKG_DIR, "src", "error-codes", "error-codes.ts");
        statSync(inner);
        expect(dirname(inner).endsWith("/error-codes")).toBe(true);
    });
});